Reverse-gear for four-cycle combustion-engines.



No. 4874,177. PATENTED DEC.` l?, M057.

I'. T. ELINGHBAUGH. Y l REVERSE EUR FOUR CYCLE GOMBUS'IION ENGINESE APPLICATION FILED JULY 9. 1907.

3 SHEETSSHEET 1.

PATENTBD. DBO.' 17; 1907.

'Nol 874,177.

P. T. ELINGHBABGH. REVERSE GEA-KEUR FOUR GYGLE GMBUS'-II0Nl ENGINES.

` APPLICATION FILED JULY 9. 1907.

a SHEETS-sunm- 2.

- wi h1 mozo Ng. 874,177.; PATENTEEDEG. 17,1190?.

E E11". PLINGEBAUGE.

REVERSE GEAR PoE'EoUE EYELE COMBUsTmN ENGINES.

,APPLIUATON-FILED-JULY9.1907.

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anbcnlo UNITED STATES PATENT OFFICE.

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-Specification'of Letters Patent.Y

Patented Dec. 17, 1907..

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Be it known that I,

' BxUGm'a citizen-,ofthe United -St'atex-i; resid-4 ing at Xorkyin thecouiity of York, 'and State .of Pennsylvania, have invented' eentaiyiti newf and useful Improvements ReversefGeais iior Four-QyeleCombustimEngines, of which the following is a specificatin.-

reverse-isidesired,

' :The invention consistslbftwo cams conf` i with/a moving 'part-of the engine ist 'and driven thereby, a movement, and

icenniec V`.means betvveenthe 'link`1`iiove-4 nient-an4 c o two members,onlyf-enebfwhichis e active` at a ti-inaA the being of formation but having' a `different`'angular `and. reverse ariia'ngernenm the toveifect opel `lfion ofthe vjaarts to drive the, engine 'in-one direction, the other teoperate t eparts to drive the engine yin the reverse direction,4 Ieach ofsaid earns having auraised portion inl addition to ;tl ie regular raised portion 'orj'operating the spark'er upon reversingthe reverse lever to eflectfcombiistoii-'oi the-'ehargefin the cvin- `derout of r lenorderfwhereby the' piston is .driven in the opposite direction, thereby completing the reverse,'{this'aunil af ry raised portion ofeachof the 'cams' coming into play once only, that 'is toriire the initial charge `after operating the reverse lever. tostart the piston in -'the 'opposite direction,l 'the regularcam 'portionoperating' the sparker thereafter so long as the engine is running'without again changing" the position of 'the reverse lever.

For a full description of-the'invention Aand the merits thereof and also to acquire "a, knowledge ofthe 'details of construction and the means'for eii'ecting the resnlt,`reference lis to'be had tothe following d eiaicription and accom anvin drawin' gs.

` While the iigivention may be adapted to different forins and conditions by changes 1n the structure and minor details VWithoi'it de partin from the spiritlor essential features V thereo still the preferredl embodiment -is shown 'the accompanying drawings, in whiche; H

Figure 1 is ia side view'of a four cycle intern cpnibustion'eng'ine provided with a` )reverse gear embodying the invention.

2 '=i s atop plan view of theengine, a portion being broken awayto show more clearly 'the v,taire rockerarins and the parts coperatinv therewith. Fig. 3 is a view in elevationo e the reverse* gear, showing" the 'same on 'a larger sc'ale. Fig. '4 is a detail view of the tjwo' 'cams land the upperv portion of the rocker arrn,.the parts being on a larger scale. 5 is a horizontal section on the line -'-a: of ig. 1, lshowing the parts on a larffer scale. lifig. 6 is a side view-of the slide. 7 is a top-view of the fsaid slide. Fig. 8 is, respectively, a front and a sectional Aview of the reverse links.v Corresponding. and like parts-are referred to in the followinor description and indicated y in all the views ci? theA drawings by the saine reference characters.

Theengine shown is illustrative of the ty e for which the invention is adapted, name y, a four cycle internal combustion engine The gaseous charge is aspirated, -Whereas the ases resulting from explosion are ex elled arranged to acquire positive ac'tion only of the sparker andtheexhaust valve, the latter being closed lautomatically with the usual Vspring and opened and held opened by the operating cam.

The sparker l, which may be of an; well known structural type is adapted to e actuated by means of a'tappet rod 2 which has lconnection with a slide 3 held in place and suitable keepers 4 and 5,. The slide 3 is pro'- vided. upon its outer side with spaced lugs 6, the inner corners of Which are made rounding, as indicated at 7, to provide for free oscillation of the idle link and at the saine time to facilitate the movement of the reverse links when shifting from one position to another, as when reversing' the engine. The slotv 3 is adapted Y to operate the exhaust valve by impact with the stem 8 thereof and which takes place upon the forward move-v ment of the slide when actuated by the -pro 'er portion of the cam.

e reverse links 9 and 110 are adapted to slide between the spaced lugs 6 and are'pivotally connected in lany manner, one link being idle and the other active, `according to the directionof travel of the engine.' ,As in- '10 are ivotally connected by means of a pin 11 which is extended at one end to Inake yy the' action of the piston, the part-s.4 eing directed in its reciprocating movements bydicated most clearly in Fie. 8, the links 9 and' connection with the pitnian 12 which connects said reverse links-with one arm 13 of a bell crank, the other arm 1e' of said-bell crank being connected. by link 15 with the reverse lever 16, the latter being provided with the usual hand latch arrangedto coperate with a notched bar to secure the reverse lever in the required position. In one 'position oi the reverse lever 16, one oi' the links 9 or 10 occupies a position betvY een the spaced. lug 6 and is active, while ai' the saine `time the other reverse link is clear of said spaced lugs and is idle so as no1; toiinpart any movement. to the slide while tree to oscillate under action ot the operating cani.

The tivoposiiions of the reverse links are in l dicated by the full anddotted lines in Fig. 5.

TWO rocker arms 1T and 1T'r1 are pivozed at 18 to the trarne of the engine and are yconnected by rods orl bars 19 and lll with 'the respective reverse links 9 and 1 0. Each rocker arm is provided v. ith a roller 20 adapted to` bear against the edge ol' Jthe respec. ive cooperating cani 21 or 21a.

ayielding force to hold their rollers in' contact with the cooperating cams. Rods or bars 22 and 22 have connection if. ith die rejslpectiverocker arms 17 and. 17?' and pass through openings in a web 23 oiI 'the engine frame and receive springs 2-'1 and 2la and set lnuts 25 and 25a by means of which the tension oiI the springs 24E and 24a is regulated,

said springs being confined upon the respective rods between the web 23- and the set" The tivo cams 21 and 21a are of like iorniation,`but have a diilerent angular arrangel ment in order to operate the engine in either erating cams is formed with the following one direction or the other. Each of the op- 'ra'ised or cam portions, namely, A, B, C and D. The cam portion a at one end of the cam ortion A eilects opening of the exhaust, the atter remaining vopen until thecam portion i) at the end of the part A is reached. rom Z) to C the engine is aspira-ting an'd drawing in a charge and from the point C to D the 'charge is compressed and at'D the sparker is actuated to effect combustion and from D to a the engineis o erating on the explosion l ide exhaust begins to open i and is held open by the cani portion A until in the enginel to drive thc piston in the oppov site direction.

stroke, and at a t the 'cam portion b' is reached when the ein.

, i i i The rocker' arms 17 and 17a are acted upon by mea-ns oi.

'slowing down of the engine.

haust closes and the engine again takes a i eren?? charge. It is noted thatI thev cam portion B is about opposite .to the cani portion D, but when the-engine is running in -one direction, v the part B will not eii'ect explosionl of the y charge because the engine `at this time is heginning to aspirate or dra-W in a charge preliminary to compressing the same foreiliect-f ive vwork when combustion takes place. When the ycam portion'D reaches position to actuate the rocker arm etl'ectively connected vvirh the slide 3. the charge is' properly compressed and the spark is produced to etlect explosion ol' the charge so as 'to impart aniinpnlse ro the engine to continue iis.

movement in the saniedireciion.v v

From lthe'ioregomg 1t will be ulnlerstood that only one rocker arm at a time' has posiJ tive or ciiective connection with the slidexto cause movementoithe lattex,-tite other whiler oscillating"being a dead member orI idle. i'pon reversing` the engine by actuat-l ing the'revers'e lever lo. the combination oi' thelinks 9 and'1() is changed, that the idle link becomes-the` active member and thil previously broken link the idle or dead member. wWhile theposition ol' the link.`- is changed with reference to the slide' 3". the .shnit lo continues to rotate in the saine direction, and since the cam 21' that was active prior. to opera-ting the reverse leve. no\.v becomes inactive and the idle cam ,321 is brought into play, the'projection'or cam portion l of' said cam 21'l operates the rocker arm 17L and tl'nfongh thefconnecting means operates the slot 8 t0 eiiect the spark mechanism, whereby the compressedcharge is exploded out oi" regular order so-as to drive the piston in the opposite direction and thereby give an initial impetus to the engine for reversing the same,l and after this initial impetus has been imparted to the engine inthe reverse direction', the cam portion D of theram 21a operates? the sparker in the regular Way so as to drive the engine continuously in the reverse direction. It is not expedient to operatethe reverse mechanism when the engine is running at high speed'and it ispreferable to materially reduce the speed toA bring the reverse mechanism into play. .The speed loi the engine maybe reduced by throwingthe sparking mechanism out of action or in anyV man'vr ner usuallyT adopted in the art to produce a Upon `operat-A ing the reverse lever, the sparker is actuatedy so as to utilize thecompressed charge inthe cylinder to eiiect a reverse of the engine instead of exploding said charge to continue to drive the engine in the same direction, and in this lies the essential ifea-ture oi the Apresent invention. The supplemental canrportion B comes into pla-y once only and that at about the instant the reverse leveri'is 'operated so as to eti'ect con'lbustion of the charge llaving thus described the invention, what claimed as new is: f l

l. lln a four cycle internal combustion engine and in combination with reverse gear therefor, like cooperating cams, each having reverse gear embodying a link motion, inde-` pendent rocker arms, and operating cams,

each of the latter having a supplemental raised portion to effect an initial operation of the sparker to explode the charge in the cylinder upon operating the reverse lever to drive the piston in the opposite direction and thereby give an initial impetus to the engine in the opposite direction,

\ 3. In an explosive engine of the type speci- 4 edan'd in combination with a reverse gear comprising a slide, pivotally connected reverse links one'having effectiveconnection with the slide and th'e other at the same time being idle, rocker arms having independent connection with said reverse links, and two like cams for actuating the rocker arms and having a ditl'erent relative angular arrangement, each of said cams'having asupplemental raised portion to come into play the instant the engine is reversed to e'lect eXplosion of the charge to give an initial impetus. to the engine in an opposite direction.

4. ln an engine of the explosive type substantially as speciiied, the combination of reverse gear therefor comprising a slide, pivoted reverse links adapted to cooperate with said slide, the one being active and the other idle, meansfor shifting said links to bring the idle link into active operation and to throw the Working link out of action., rocker arms, connecting means between said rocker arms and the reverse links, like cams 'for the rocker arms each having a supplemental raised portion, said cams having a different relative angular arrangement, whereby upon reversing the engine the supplemental raised portion of the idle cam comes into play to eilect explosion oi the compressive charge in the cylinder to give an initial impetus tothe piston in the opposite direction, thereby utilizing the charge of the engine to etli'ect reversing the rod, andmeans for holding said vrocker arms in active cooperation with the said cams. i n

In testimony whereof l aliix my signature in presence of tivo Witnesses. FREDERICK T. FIIINHBAUGII. 8.] Witnesses JOHN E. Een, GEORGE R. BOND. 

